SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eef1d1291da5b78de0a41da32c5adb347cafcd6afe4affcbb993f28f3b20873' 
  AND token = 'gXJw+/DDTy1UB9azdsqdnzDlZ8Z2ILdMZq+RmQIxg2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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