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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a7988ab9f93d221fa62cf19dc349d0032051bc9fa0bcbe6b9b3219ed124404f' 
  AND token = 'g84uj2WSS+1y33cdKjrI8iuIrNxCKqY6LgbSTlxrFVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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