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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abd484cabbed84f8e30b11fc7dcadc314f8e49777d4f082117c45eaa28c470ae' 
  AND token = '2m/NIcx8dYbF6eloZ7T8EbDu4bfuQE0k9eHBNmII7eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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