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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48776f3eef7465049ec98f968752c72a3d99e2b729b6a3a2d8c20521e2d82454' 
  AND token = '5zSaBaaIgkMdsqsVK8oWRet4tdLaNsffELGJcM23hU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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