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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c724a3e07db846edd69d07fd51cc2c67435baec1f30bf7f9d38cb6cfc78ef619' 
  AND token = 'PQeVKxXibqgqL47sRWOqlWp9r94lXCf7o/Tw6i2t24Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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