SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b2c876ae602d5464d50c26bc727ced3cfdf2d366c74d97ec97983029089aedf' 
  AND token = 'PZ0+xSX7WujaK/4KQelVQHZvVJlUbIGXCgzy9HuEwJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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