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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d1469d763d31a844fcfac4e13128c97874b4aa2eb03e3c1bb72ff8cf8a0689c' 
  AND token = 'QVrTM4GQG8AwP3gCbGKSvJgF9TsIk9mYkSQYgl50H98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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