SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a5aa442f4d7aed5e31a7d302661ff07f5e39b3ba32030b98b2375d089983ba7' 
  AND token = '4QijwFKBbSYmC7bt5wtBigDQyU5F1+s+npld15JGmDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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