Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a571c7ba95e498bf8c7d74b792441196970763626099d588bb93e514a428c21' 
  AND token = 'Y7me9McFH+MLTn4XfXucm61AOuPvUWn9HHMktrRpF9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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