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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09cc7d96a3602cd24e322f3fc4d53d89d6529a3502d03636d711d8d423be7deb' 
  AND token = 'odXS1vhmtsI77hKCLx4eS9h48ePJNZN5FPl3imtmkdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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