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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20eeb038920264a3bc42d7ef829f8a9bdc0d21ecc3c234da0fae83ea380deb82' 
  AND token = 'qrxX9tyauxenJ6cR2THfFA9UwL/KcMMRomgMc62Twxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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