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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb9da2cb005bdec445a285fb812e770a4899e8d1903bdf5d329dbadaa5029cea' 
  AND token = 'LvkgES8l0GDUJccMokWbjpsMzXBtFB2BL/j8jQcOa7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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