SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77b3b42cd8f73e65c469058fef62b2b42ee13216e674ad990ddf3aec068c65e1' 
  AND token = 'LzijQoNLxHGKtAUm3wr9upyqjg3RDFGAaKElghYfsrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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