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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0439a0f1e72c167be7b7e75c3c59b2dbefb0c5dd3486de90111bf5cdd34787a' 
  AND token = 'mIrPT5OLPwwpLQk0kFONbx5XuQcA6u/z99TGW4N2c8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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