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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '213a29d2cbd2f69ebf93de5aea5828bcd1a5f10accc40545f08c15ea66f5b4f3' 
  AND token = 'VOPs1DiLCJZ8JPAsJARvNp0b5joU1+aWyP05u4jeMFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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