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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d942287d745040f269f69ac829ea9fca36375d4f594b0ce1122e8ebe61052ab' 
  AND token = 'nDVjvpWQpKUaj7+NRWNQGVfk9W8UMBbLEtW7dd+v4jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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