SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fe79e2946f23e6f37da81d052e05beb8c81f994cbef184a2c11f5ef12f508e8' 
  AND token = 'JY11g5TZ4UmPXkCufvj4haHeRlAWjMTsi+4RZGXqKvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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