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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '578375c48454444f030722f78c2c020a342964e099911d2bbeae7a863bd61735' 
  AND token = 'zj4F8yJ75BbHHeAiUEC6PV39r/bGufWfpDcTFUsT6aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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