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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4e73fe9948173dbcb46897b02350ccc132a8e83c301319447f878c7bab735e8' 
  AND token = 'GzyG3v7eBw7AXodMJ8LvGh51NbZmvhKVqmYnAetrh30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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