SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51662c88824b64730e6e453bc701ffd629aa54b163d1f02615d0e28a40c7cd3e' 
  AND token = 'RtD6AKlSCx7N356oYI4Q9qVvBoshOUMGJMQ8U3Z3lyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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