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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ed9d34acd924e043c28da55d4dbdd032f59f0813682e1d21d23ae5633b1ec78' 
  AND token = 'JrNZawA0NVt6kVekNvbDpAIeAV9Ij0GS1IoNiAfCyqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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