SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04fcc565752c4166b45af8b56b07571fa00012f69a14c8e39b522bf0a789f7b5' 
  AND token = 'xwK8v0MdJDqs25nnJJf79SbuhOLcSAVxJjz+nEu98/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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