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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c80af79013f03aeb7777897e42646c15d4c20add7b58043d8e0ddb20cadfe41e' 
  AND token = 'qYyT4RgF5tQTfD8efCfCy/qh6XsFCF7FRIN4G+9c03Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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