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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe0e4b54eab1978945dbf10dd93a09e99f5ae39b3508e769f45065ba0bc58c77' 
  AND token = 'F8NmwwI8fT0Eha+drb9NlXK3WqKn3+fHT90CV9Dn8XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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