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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c90821656e52a7e68afab9cf88cbcb7ba233179a8895f270db86a55ff71109' 
  AND token = 'okK1/7cvltPtXqiXcQLsEyNS31220eO2zCHsVpCh1CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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