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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5795facc53d9ccb0bd510363c43031aa1fe5667375cd46a48b11c8d4f32ba6a6' 
  AND token = 'q/BIm2WT8ws4nE9mf+id9dQuF/IKFx3mLe2issgtl88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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