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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f00177dc1601c4c058ca2f005cfc662a3931e752fede321ba476b8924d0c1a81' 
  AND token = 'TXyCtGGfE+7Hdx5RcIZDNl5NEN/M1dt8dBBcqmO90jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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