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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7759d75c73e43f9131286713fbdee59b65d934e95380898f604c2642e04388fa' 
  AND token = '3wcrdg7fQRDbWIefEz4IYjbyR6Dl+/uOlXt11W5ikY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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