SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e58a93924a6583b74d2981750f3441214afaa813cb8aaeaf06889c89964eb2f' 
  AND token = 'RXhQcf3yjCSYEwvyFY/T/dWLst7Ks9IY0sOZqs+p/D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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