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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90646ced4355ab9dc0ad524201fa8e13849bad968e244b27bf1c538dbf84aaa5' 
  AND token = 'yMg/1y+EWWAQUpn95WMw497UVqYB7O8CPS2yQHPWsCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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