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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cb5386308e51b08e8b8c33ad8efcf3870d88a8328ae0bf0d0e42a47edc2afc4' 
  AND token = 'ctIEYE4QiPBAXqJPDBjo8m3WjjpCVxiLpSce/kbJlh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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