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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34f5ff8455fc07c6da2ce6f100051a2894db9025a410249f6320b76d342d4341' 
  AND token = '44YfGmsHjzjEg2PWkIN/hmUntUpNkcTZlkNlACMN/Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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