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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a4553bc481f74c6da7da04985924eef16e97bb5bb339aef5d1571a5dbe9b96c' 
  AND token = 'S+tu+GuWFsUQs7xS1LOaXmxPqdAR94haslu9wSZrPO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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