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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d4df9f96a4b92101c20e4bbb0aacf3f4c7ea12b8c6d09dcfd262070ab3d35ff' 
  AND token = 'WCTGcawmaRdkVC19UpImOJ5QdYhVj3gFQ6Xxz2EvErQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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