SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16b5ac8e6321cd51891df3e4e125a629786e52f3e789c8046f3840101b7554ff' 
  AND token = 'dAF+mfslu79kTW6ZFHmyvrVl9GP5tPzZXOJoCVnC3Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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