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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a11e06e14dd41496fbefc3ac59e601fd255f6f34c991ed7d8ab52cdedfe0b530' 
  AND token = 'kwFrVdShOKsSE+OifqS9PuR7rz7E0T9yjBoJJaefiso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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