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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8894670ce6ea3bec95a84098f6ede1ded9995c704b588ae7a6da7e1862b649bd' 
  AND token = 'I8tTvgXLoi+56nm55RkpOt3r+8dEbvnPuHgtFAyD9A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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