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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0df88e28dbf736965695f36881a4961397152c2ea1c950f78de0fd26a81d8f27' 
  AND token = 'rcUa8zet5h8PIMVG4T/EuCCv9viJlhCT+TaIh6j2DTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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