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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'debad4a35f6765ed21f1b23e771721488859025db43364c11c38001efab5e8cf' 
  AND token = 'WTSaSnJZzOaxfTIfV8gcFcOL36AXZxYhK0zNDeYtoIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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