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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd6ce6a3d1edbe66e3571890485b14481f47f55cde178f98526691c4c46cc6e6' 
  AND token = 'mdiTvxSnR72oP/vsSljdaMOvm7Sks6xIpYKTl6vFKyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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