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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83b3ce81e1c40d389e10273583742b7244c0cbd2260830eb2b63ee6cce52f7dc' 
  AND token = 'nZBi7piTmLtXaEUNIMFNPuSvVkkV0O0Z0nN8U3HbOeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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