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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4b41e81a82dd7e8e99e94ec5b5010ea847cfda337c2a47ac80fecc87f6d77e5' 
  AND token = 'QyJ3bEaIW2e0fZxZNtIh8f2dLhNCjmyUaegcr19iEq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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