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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc024d9f0197cc470bac1acaea5fcd8c6f767642e53a76b0866a987df81ac05c' 
  AND token = 'WDe2ykAcUi39CJx05NRvlvBchjo/i+Jn/8s8GxKhBRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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