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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e1de98afed54fbfa116bc6ef3cd309f055d15881e5b5b9e64754bd212b28e1b' 
  AND token = 'A9s/CeCHXd88XNDGRjt+L6OlzqjXf5tG4cJxGhyoZ0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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