SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcf76a13c8847ba1beac903e14ecf4116441187919361ac63b68b581e07407f0' 
  AND token = 'pX8vR0gZqrHijBBQa5Pn3wkkZJ1NItK+rVQPbfDCKFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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