SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '289e91a856055f10184d34b586892b147b48927c1e2507af3c3ede9846e541d0' 
  AND token = '6DQHtFGJthNEWQyc4m5rXQhijIl3Q/3A6IBS+WzQX+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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