Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b74c2edf4134ed04a0506f8fd291f00d6018e53ef737646bfbf736af4d6465f' 
  AND token = 'rMvGIS0E0OTx8WfHTBB1bRtpg57EQIvBb6+9LHV8sqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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