SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b5c9a3532e6d3cb9ddf96a6f7f810da80c6980912655dbe4569b5b028cb14b2' 
  AND token = '0V/F0IKzUWl5W6xha6WY0V2KI5JJ42FfbyKzxWvCg+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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