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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37cdc43fc32db1568b31af8176c67b7e87dbe057fa54ac6ec4f17e8840ac9c4d' 
  AND token = 'zV3I9gOeg6Y/z7VNbes6C/HbHZIb9IgjDElc1JfWZfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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