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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dce5f6dc54e777c5ecd41a1f13bfd667e41a8101cd53497441b5916a4e119fe' 
  AND token = 'WF3q6dF5lv7jbr2Azy3Mt1q1YZDw77Vbetkp147M2Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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