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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '474c6962fb59b6266b35f79fea6cd3eca6e4ee5cbf8acb67ff8abd3fe82d1169' 
  AND token = 'VJns3W3Zli+A5NmRMk3TapJdVplFhPLwTwZHQs8gm+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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