SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d71abf2c71a825a378e76502f93d3369696c111ca02bfef3ebb1d08747d0213' 
  AND token = 'CYFXxy8ED7Wfl92BTjhHSTzJqcAL5oKLhuGzz9xC+gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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