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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd68c599c78ddce35e59b0a2180a3dfca9e614d86f8b72e8cbccb4f174a40cee8' 
  AND token = '2XWRj+ls1cEE9ZZt8fMG/dxFwK2NS+PnteE/XU8Yilo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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