SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e217c9b5ca4167aca46bd30f63d0d1a125b06f95ff34da8481ef3f66497d45d8' 
  AND token = 'v0oZG5jy8hJV9LEvUzJqgOHXB0ZA4p2pZmBBbKf59pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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