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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2193c1f6a12afc68a113a518b135fc25151743c7da6a82274a41253e0dd15706' 
  AND token = 'w+7lhsIoWwA2Jrgr39sCa0lQ+Kg08Nc5/AZaBm4Xv6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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