SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c545e44d30eaff1082e257c957205ca68852558a7b13d62220a812d5c004c5f' 
  AND token = 'nnZi9jxMwPZA/Fil4Y+MNFYyDZQDQ9iqmhwBs/3qDGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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