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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d787e2b6fb647fedc1ebe86bb7c41e9bd6831a621387813a843b4727c8fad48' 
  AND token = 'ekcedyPcbLcQQw06IN+Stk8MfZCBtxw2bdvY4Vj+h+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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