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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a58b7ac1a0f7af753aaa28ecddb585f47c7f37f203d3172377fd25023e36101f' 
  AND token = 'gv52A2mfz4DNPg3957rKwsDwFv7IDthByilIFY8jbGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}