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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d9dbb8502948e049b12fd7bb1be180676cd5bf4b55675dcd8fb221f878ad878' 
  AND token = 'xd8eLFI+JiTFxYYd/vsdxdbsPsaMhsrjVduWAh9XQFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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