SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74f5a2ec6e3889760be98fb353a3a221585f9659fc95ee467c85e7b8e1e503bc' 
  AND token = 'xK/PjB+EjxRZIdG9gkYoWCSZMRNp3+0B2g2cMHhu2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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