SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44702832af787fc07a96cf2f9e047419300f684d78eaab605d062179eccb5d6d' 
  AND token = 'zcuJeE7dD7kgzSgg9jZjHjDRn46BXQjvKjYg5rq1kEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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