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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83048d3400b0346b0212c01cb71c830db7d700eb7e78b75bb995ec25e600990f' 
  AND token = '3qh2xqqrlW5/Wk3TB/jwxDM4Jf0lf4rEJBKxbHNmM94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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