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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a515a2f7c3a6a79dc18dd440742abc91e872e8c1659fa412bfbb3d8c0d3d695e' 
  AND token = 'pFdQMItQE7lPD/REpuzCwDCQMsUfi8TYH0wwIMM6BPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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