SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5fae8a49b0c048ac0b431b6ae982874853bdd54ca8c4f3fa7312882cf4bb1ff' 
  AND token = 'WETg6nKjLXxLmvKnuwJdlNHMh2GbX9dwRiwDZzwV3J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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