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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa99b3d6760ede09ff081a566474e91b93823564eaa6c60a710347b2ee311f96' 
  AND token = 'LrMcVlOaQAV/u8RoCvooqoTbDUqp04XTnTGCJTF7eBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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