SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac0fa34bcb20dd60558427e317c5f3e5e3a4c780f87e65f5aef7b59d94354e77' 
  AND token = '+y9TXOWHAqo0tyfKWWBPdjYFbZiM6QqEUuWJkmSL2GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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