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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a74dbd8eec347ed959cee90cb0b04bd35f60af8cbecab7f27693807b7ab854e' 
  AND token = 'xTDO2ixWQdj+ifNmqynKvN1HaYQsruLhIQLjcH+ARJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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