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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '393d65633a2ed4f0e4aedbbf9731a35090cc59a2fff7501add462304da2912e3' 
  AND token = 'yHMlluTLeKAARZ6a7W9AlTvl6HeOb4CNsj5b1vxEwAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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