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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5996f7106098644f50499520b1f7e9ee663cd3d9ebc1a14bea718d05e36634f8' 
  AND token = '5IEHk87hkRWq84XuSG4wNerLxV8WsxJ8sicnVIIJACg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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