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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '110d1252ed0dbe03b8b391142e288d55c2388735a463075e78457f34ed720553' 
  AND token = 'rC31VIB0V8qUmEN8tpaUMt0DkTvqordCMvrys1e4vwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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