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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6655b15a29826a8e66e7fd7e1585d61eb0e2dc39c42df43027f7f43e71a6a235' 
  AND token = 'I3o+n9gUQkUIxXFuoktd32MLNynFOt0HneZ0dB9no+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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