SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc116c64da84c32566ee5031b2a2b8906476bc0ff5fc312459f37652b8c2321a' 
  AND token = '/V9mPwQZKhfKJhvx2V29336hCNpM2SXYQEiA6lQ0SPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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