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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2a7650c7f6b6d9b434109480bdc5acaea2f846599ec647716f70881fa09ee96' 
  AND token = 'YTUlYYBS2yt5udKf1QSvndw87U8urmFkSW+8TkrUO8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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