SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f17c50edddf5a884898843a3c3a4130a805b15203a7c81e60bd7322bb76d2d9' 
  AND token = 'UqBSBcXCnuaQoRBJGKQXldLPfOg2LvNogm65DEfAN8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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