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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4d502498c361af0ee3d963c5305f6d6ae0490b4c78893676f01b2ac39f92528' 
  AND token = 'i3rUmS9j5w6PljqKSHbVa0nj3k6qJLSRP1sIVjGUhPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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