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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e7d4e9e9c866c8451e7b8617ef24ebe0a060758018211d773efb7f81a08fa42' 
  AND token = 'qQewQgE8nEj+0h1ykL73S5OsrITwIYATQpx9j+vI98Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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