SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b84da959af93d6a3aa4f6597863299ce630c11ca78d5e6378e8a9ff312a2cd6b' 
  AND token = 'fvphBgUJsC/FOy5l6d57+vtru0twyjxnzTm0rubHuHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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