SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46ead4ed46b0b90ccfbece535b40e08809514897b12fabd7119aa7364cde8572' 
  AND token = 'bZGNsBV1+zO6hP6L8+iQZpoFpr1fRMdZjUpmdSqYi7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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