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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c6ee742892a915484aac2b2c6cceb6da7eefa02a8f6ec0e0c293cd7ae4e1027' 
  AND token = 'd5PG1i9X0kEj9Xb8xIuarhhuTQRSFfADlUdUBOMeiOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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