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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '498965a886b9296adb812bd00e26e6221da509f7dca0fdac50c9b14aa36424e8' 
  AND token = 'qnartpMniEI7aqEopIWPnO6I9Tn9g404Tr97pwEZzgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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