SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca62d60347035677e63fcf21dddd8d5462b124a7ea5f4ad78e2f8703cb34619' 
  AND token = '3EZ0EspgVqeER1cWIrj/Kop+5W+AxJLTPnYzW7NceHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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