Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '310769628c4f3329c0ef5384498786944be12f1f05ac9202d0990770d22b9b86' 
  AND token = 'PnXaeVh1RktmW+ObJcGklrltp3tApdrrAT6IOJfriEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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