Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '775578b1007caf13f42b2a8317f349837e0e63a1896601d8c0732876859616e3' 
  AND token = 'NdvoTwniDpQHqU1Y9NfN4qG+80H8BVB8MWFkSdfoWeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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